Headset Buddy External Dynamic Mic (with batteries) to iPhone Adapter (iPhone-Mic-Dynamic) Use a dynamic or battery-operated microphone as an external mic on your smartphone or tablet Not for use with ECM mics such as batteryless lavalier, pc, or headset mics Works with most smartphones that have a combined headset and mic jack Passive DC blocking/isolation and impedance matching allows for use of many different types of microphones Crystal clear sound recording, 100% guaranteed